Tube-drawing machine.



R. KOENIG.

TUBE DRAWING MACHINE.

APPLICATION FILED MAY 18, 1911.

Patented Mar. 12, 1912.

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R. KOENIG.

TUBE DRAWING MACHINE.

APPLICATION FILED MAY 18, 1911.

1,019,805, Patented Mar. 12, 1912.

2 SHEETS-SHEET 2.

Witmmeo UNITED STATES PATENT OFFICE.

ROBERT KOENIG, OF BROOKLYN, NEW YORK. ASSIGNOR' I0 PHENIX TUBE COMPANY,OF BROOKLYN, NEW YORK, A CORPORATION OF NEW JERSEY.

TUBE-DRAWING MACHINE.

Specification of Letters Patent.

Patented Mar. 12, 1912.

Application filed May 18, 1911. Serial No. 627,950.

'l'o all whom it may concern:

of. New York, have invented new and useful Improvements in Tube-DrawingMachines, of which the following is a specification.

My invention relates to the manufacture of sheathed tubes, which arecomposed of an inner seamed tube of steel or iron, and an outer seamedcovering of metal such as brass, the inner tube contributing strengthand the covering or sheathing giving the.

desired finish. Such tubes are made by forming bands of metal into splitor seamed tubular shape, and are usually brazed at the seam. Theheretofore used method of mak ing such sheathed tubes is that describedin Skogses United States Patent No. 617,363, dated January 10, 1899, andlarge quantities of sheathed tubing have been produced by this method,though it presents sundry de fects which it is the object of my presentinvention to remedy. Chief among these defects, incidental to the Skogsemethod, are de artfire from true cylindrical form inthe finished tube,and waste, due to damage of the thin relatively delicate brass sheathingby roughness and irregularities of the inner steel core-tube. Therolling and shaping of the inner steel tube, by the Skogse methodinvolves the application of rolling pressure from the unyielding rollsthrough the thin brass strip, and the inevitable occasional roughnessesand irregularities in the steel core bruise and tear the thin brass.

My invention consists in a drawing machine for sheathing tubes, and isexemplified by the machine illustrated in accompanying drawings, inwhich- Figure 1 is a top plan view of the sheath forming and tubedrawing devices, Fig. 2 is a view, partly in side elevation and partsection of the said devices, Fig. 3 is an end elevation (viewed from theleft in Fig. 1) of portions of the machine, Fig. 4 is a cross section ofportions of the machine, taken at the line 4:4 of Fig. 1, viewed in thedirection shown by the arrow, Fig. 5- is a cross section taken at line5--5, Fig. 1, showing part of the edge turning die and the two tubemembers, Fig. 6 is a cross sec tion taken at the line 6-6, Fig. 1, andFig. 7 is aplan view, showing the gradual development of the materialsinto a completed sheathed tube, ready for brazing.

The core tube T isfirst prepared by rolling from a strip in a machinesuch as is shown in the said Skogse patent, or by other means ifpracticable or desired, so that when it is introduced into the sheathingmachine it has had all roughnesses and protuberances rolled smooth .bythe hardened surfaces of the rolls in the forming machine, and is thusin condition to receive a thin sheath of brass or other suitablesheathing metal.

The drawing machine is provided with a suitable drawing head or dog (notshown) such as is usual in drawin benches, and with a standard D, onwhich t e bridge 0 is mounted. The bending funnel E is secured in thestandard D, and the tube guide F, provided with thedepending web F issecured to the bridge C. Die plates M and M are secured to thedraw-bench, the die plate M having a slightly conoidal constricting dieat m, and the plate M a finishing die at m. The edge-turning die L ismounted in the constricting die opening, and presents to thetube-members a central fin L and inclined edge-turning surfaces L'-.

The tube-core T, with its longitudinal open seam T is introduced throughthe bending funnel E, the seam T embracing the tube ide F, which guidesthe tube T so thatt e fin L f the edge turnin die will also enter theseam T. A strip of brass or other suitable metal, drawn ,from the reelR, is introduced into the funnel E, and thereby bent upwardly around thetube core T. The narrowed end of the bending funnel E, shown in Fig. 4,delivers the sheath-strip B to the edge-turning surfaces L? of theedge-turning die L; the die L turns the edge of the sheath-strip inwardand downward into the open seam T of the tube core T, as shown in Fig.5. As the tube core T and inturned sheath strip B passfolds of thesheath strip into close engage ment with the fin L and thus, by reasonof the flow of metal, turning the edges of the sheath strip under theedges of the seam T,

as illustrated in Fig. 6. Thence the sheathed tube passes to thefinishingndie m, where the seam is drawn close, and a1 true cylindricalform given to the sheathed tube, which is then ready to be brazed.Bythus using a tube core which has been rolled smooth and then folding,edge turning and drawing a tube-sheath over it, engaging the sheath withthe core at their common seam,

and finally drawing the sheathed tube in a.

finishing mandrel, a truly cylindrical finished product results, andwaste due to inguide to extend through the seam of a tube to besheathed, aneclge-turning die to infold the edges of a tube sheath intothe seam of a tube, a u'ide fin alined with the tube guide and gni wayof the edge turning die surfaces, and aconstricting die.

2. In a drawing machine for sheathing seamed tubes, the combination ofa'bending' funnel, a tube guide to extend through the seam of a tube tobe sheathed, an edgeturning die to infold the edges of a tube sheathinto the seam of a tube, a guide fin alined with the tube guide andmidway of the edge turning die surfaces, and a constricting die.

Signed by me at Brooklyn, New York, this th day of May 1911. t

ROBERT KOENIG.

\Vitnesses:

EUGENE V. GALLAGHER, J AMES W. HICKEY.

